Container construction



D. 15, 1942. Q, w WENTZ l 2,305,366

CONTAINER CONSTRUCTION ATTORNEY I Dec. v15, 1942. o, w wEN-rz CONTAINER CONSTRUCTION Filed May 13, 1939 4, Sheets-Sheep* 2 INVENTOR 05cm? M h-wrz.

ATTORNEY Illlllllll IIIIIIII D ec. 15, 1942. O, W wEN-rz CONTAINER CONSTRUCTION Filed May 13, 1939 4y sheets-sheet 5 55 INVENTOR 0564A I4( WHW-1 Patente l5, 1942 I' CONTAINER CGNSTRUCTION @scar W. Wentz, Long Island City, N. Y., assigner to United States Automatic Box Machinery Co.,

Inc., Boston, Mass., a cor setts poration of Massachu- Application May 13, 1939, Serial No. 273,483

3 Claims.

Tins invention relates to container construction, more particularly to improvements in liquidy proof containers of paper or like material and in a method of making containers and enclosing the contents therein.

tainer and the closure at the bottom and intervening sides is achieved in a dependable, simple and inexpensive manner. Another object is to provide a container construction, foldable out of a blank or appropriately shaped sheet of materisk of interference, of breakage, or of tearing,

and to make possible higher speed of folding.

operations. Another object is to provide a blank of paper or suitable sheet material shaped so as to be capable of being folded into a container body by mechanism including a so-called block but constructed in such a way that, without detracting from the achievement of certain other objects withdrawal of the block from the formed container body may be speedily and leillciently eected without risk oi' harm to the material of the container body. Another object is to provide a paper container construction well adapted for dependably handling liquids and well adapted to meet various requirements such as those varied requirements met with in the packaging and handling of, for example, milk, and well capable of withstanding the varied hazards of handling, carrying and transportation, as in milk deliveries, when lled. Another object is to provide a container construction of the above-mentioned character with the closure capable of convenient unfolding to provide an adequately large pouring spout for the discharge of the contents and which,

or folded position, does not ldevor more adjacent containers, thereby to insure maximum utilization o1' the space-in which a plurality of iilled containers may be arranged, as in a shipping or carrying case. Other objects will be in part obvious or in part pointed out hereinafter.

The invention accordingly consists in the features of construction, combinations of elements, arrangements of parts, and in the several steps and relation and order of each of the same to one or more of the others, all as will be illustratively described herein, and the scope of the application of which will be indicated in the following claims.

In the accompanying drawings in which are shown by way of illustration a preferred embodiment of the mechanical features of `my invention v and a 'preferred sequence of steps diagrammatically shown,

Figure 1 is a plan of a blank; Figures 2 and 3 are perspective views showing certain stages of folding:

Figure 4 is a view seen from the top in Figure 3; Figure 5 is a bottom view at another stage; Figure 6 is a section on line 0-6 of Figure 5; Figure 7 is a perspective of a pressure memberf Figures 8, 9 and 10 are views of the closure end;

a closure clamp perspective showing it applied; bottom view and Figure 14 is a sectional view showing operating tools therefor and Figures i5 and 16 are bottom views and Figure 17 is a sectional view showing operating tools therefor. l

Similar reference characters refer to similar parts throughout the several views in the drawings. In making up the container of my invention, I prefer to make it out of a single piece or blank of suitable sheet material, hereinafter for connot by` way of limitation teli'ned paper," and the material may be of paper, cardboard, or other appropriate fibrous or came 2 material; in Figure 1 I have shown in development a preferred form of blank out oi' which te make the container. Illustratively and preferably the blank is in general rectangular in outline particularly where it is desired to achieve certain features of my invention, as later herein pointed out, though it is to be understood that the blank in outline may be varied in shape as may be dictated by other factors such as, for example, whether or not the container body is to be tapered so as to permit nesting of one body within the other.

In the illustrative embodiment it is assumed for purposes of illustration that the container body is not to be tapered and also that in crosssection it is to be substantially squared.` Accordingly, and substantially centrally of the blank, I provide score or fold lines I8, II, I2 and I3 outlining what is ultimately to become the square bottom I4, and respectively to the right and left of the bottom I4 score lines I5, I8, I1 and I8, I! and 28 outline, with their respective bounding sides of the bottom I4, end walls 2I and 22, the latter being illustratively rectangular where no taper of the container body is to be provided.

For purposes later more fully explained, the score lines I5, I1 are extended toward the right to the edge of the blank, as at 23 and 25, respectively, these extensions 23 and 25 being outwardly divergent, as indicated, and preferably to a substantial degree. Score lines 21 and 28 form with the score line I5, with the latter as its base, a panel 24 which is shaped like a triangle, illustratively substantially equilateral, but these two score lines, rather than meeting in a point, are preferably made to diverge from each other as at 21 and 28* to terminate in the edge of the blank at spaced points.

Score lines 23 and 21 will be seen to subtend a substantial angle which is bisected by the score line 3I, to provide triangular panels 28 and 28 of which the latter has formed therein a score line 30 which is in line with the score line I5 and preferably extends from the edge of the blank to a point about half way along the panel 28.

In like manner the area between score lines 25 and 28 is bisected by a score line 82 to provide the two triangular panels 83 vand 34 of which the latter is provided with a score or fold line 25 that is in line with the score line I1 and which, like score line 38, mayand preferably does fall short of meeting the score line I1.

Preferably triangular panels 28 and 28 are equal and the right-hand edge of the blank is cut, as indicated in Figure l, to provide edge portions 38 and 88 which preferably make an angle to each other, as suggested in Figure 1. Similarly, panels 38 and 84 are preferably equal triangles with edge portions 48 and 4I shaped by appropriately cutting the edge of the blank.

To the upper side, as viewed in Figure 1, of the score lines I-23, is outlined a side wall portion 42 preferably by cutting the edge of the blank, as at 43, to be parallel with the score line I5 and as at 44 to be symmetrical about the longitudinal center line of the side wall portion 42 with the score line 28, the part 42 being preferably to duplicate the above-described score lines, panels,I etc., that are to the right of the line- 52, 8|, 82, and the cut edges 83 and 84. Score lines 58 and 82 are thus preferably outwardly divergent extensions of the score lines I8, 28 of the end wall 22, while the triangular panels 54 and 80 contain score lines 55 and 58 which extend in line respectively with the score lines I8 and and preferably fall short, as indicated, of joining the latter.

In like manner, there is a side wall portion 51 above the score lines I8, 58 formed by the preferably cut edges 88, 88 and 18. To the lower side of the score line 28, 82 is a side wall portion 1I defined in part by the latter and by the preferably cut edges 12, 13 and 14.

. Again' referring to Figure 1, it will be seen that score line I3 is extended at both ends in score lines 15 and 18 which, where the container is not to be tapered, preferably are in line with score line I3 itself, and 1n a similar manner score line II at the other side of the bottom I4 is'extended as at 11 and 18. There are thus provided two areas in the blank subtended respectively by score lines 15, I8, 11 and 18, I2, 18; these areas are scored and cut preferably in an identical manner.

Thus, considering first the first of these areas,

it is cut and scored to provide a large flap 18, a smaller flap 88, and a preferably still smaller flap 8i, all preferably Joined together and integral throughout and made readily foldable relative to each-other by the score lines 82 and 83 which extend diagonally to the corners A vand B of the bottom I4. Flap J8 is thus an extension of the side wall portion 81, being joined to it along the fold line 15 and will be seen to extend toward the side wall portion 42 to which it preferably just falls short of contacting because of the slot-like cut-out portion 84. extension of the side wall portion 42 being Joined thereto along the fold line 11 and preferably and,`

illustratively the base of the flap 8l, being the fold line 11, falls short of being equal to the lefthand dimension of the side wallportion 42, i1-

lustratively about one-half of the latter, the rebounded preferably by a cut edge at its rightv bottom I4, the blank is scored, cut and shaped maining half being a cut edge 88. The inter' mediate flap 88 has for its base the fold line I8 and is bounded by the fold line 82 and 83 and by the cut edge 81 which forms part of the boundary of the irregularly shaped slot-like cut-out 84. The bounding cut edge 88 of the flap 8I is likewise part of the bounding edge of this cut out 84.

In like manner, the other area has formed therein a large flap 88 separated from the smaller flap bythe diagonal score line 8l and the cutout 82, and a preferably still smaller flap 83 separated from flap 88 by the score line 84. The cut-out 92 gives the three flaps irregular cut edges 85, 88 and 81, preferably symmetrical to the cut edges 88, 81 'and 88, respectively, of the flaps 18, 88 and 8l. y

To a blank formed like that above described, adhesive may now be applied and the arrangement is preferably such as to gain the advantage of applying adhesive to surfaces on one side of the blank itself: adhesive is applied,as indicated Flap 8i isanl gether.

in Figure 1, to the side wall portion 81, its flap extension 19, flaps 80 and 8|. and to all of side wall portion 1 I, its flap extension 89, and to flaps and 93, whence the folding operations may take place preferably with respect to and in connection with any suitable mechanism including a block |00 (Figure 2). Block |00 has a lower portion |0| which, where the container body is not tapered, is of uniform horizontal cross-section,

a cross-section substantially matching the bottom |4 of the blank and in .vertical dimension is equal to the height of the end walls 2|, 22; it has an upper portion |02 which is shaped somewhat like that of a 'parallelopiped having a base whose cross-section is equal to the cross-section of the upper end of the block portion IOI (equal to the bottom I4 where there is no taperingv of the container) and a corresponding -upper face, but truncated at its corners, due to the gradual bevalling ofI of the corners as at |02, as is indicated in Figure 2.

Any suitable means may be employed to relate the blank andthe block |00 together with the lower end of'block portion IOI having registered and held against it the bottom I4 of the blank, whereupon and as shown in Figure 2, that portion of the blank that is to left of the score line 11-II-18 is swung upwardly to bring the end wall 2| against and in registry with the left-hand vertical face of the block portion |0I, against which it may be held; thereupon, the side wall portion 42 is swung or folded about the score line I53I to bring its lower part against the front face of the block portion IOI and its upper portion toward the face of the upper block portion |02; in like manner, the side wall portion 48 is folded about the score line |1-32 against the rear face of the block IOI.

In accomplishing these folding steps flaps 8| and 80 are laid or folded against each other about the fold line 83 with their adhesive bearing surfaces in contact and the resultant composite flap is folded downwardly about the fold line I0 to assume a position substantially in the vertical plane of the side wall portion 42, leaving exposed, however, a substantial portion of the adhesive bearing face of flap 80 which for that purpose is preferably made larger in area than the flap 8I.

A similar action takes place at the rear lower edge of the block |00 where flaps 83 and 90 are likewise folded against each other, leaving a substantial adhesive bearing area of the larger flap 90 exposed and the composite ap 80-93 being folded downwardly about Pthe fold line I2.

Next the portion' of the blank to the right of sion 1S. There results a composite flap made up of the interfolded and overlapping flaps 8|, 80 and 19 of which the largest, namely flap 19, projects downwardly beyond the composite flap 80--8I to leave an exposed adhesive-bearing surface facing inwardly, as is better shown in Figure 3.

During these various folding operations, in which any suitable means may be employed for effecting the holding and folding of the various parts, any suitable means may be employed to apply appropriate pressure to such superimposed parts as may have adhesive therebetween, for insuring appropriate initial gripping by or setting of the adhesive. Also, there is applied appro-l priate pressure upon the upper trapezoidal portions of the side wall portions 81 and 42 to press them against the face of the upper block portion |02 and likewise with respect to the upper trapezoidal portions of the side wall portions 1I and 40 which are pressed against the corresponding opposite face of the block portion |02. 'Ihe upper open mouth of the container is, ultimately after removal of block |00 and when viewed from above in Figure 3, narrower in one direction and longer in the other than the cross-section of the main body portion ofthe container,

score line 15-I3-16 is folded upwardly about the fold line I3 as an axis to bring the end wall 22 against the right-hand face of the lower block portion |0I, whereupon the side wall portion 61 and its large flap extension 19, both bearing adhesive, are folded about score-line Iii-55 in order thereby to superimpose the side wall portion 61 upon the side wall portion 42 which, in the illustrative embodiment, are preferably of the same shape and dimension, and since the part 61 carries the adhesive, these two now superimposed side wall portions 61 and 42 become secured to- During this folding operation, ap extension 10 is brought substantially into the vertical plane of the composite flap SI1-8| against which the upper portion of its adhesive-bearing face is laid, thus providing the adhesive for securing flap 8| to ap extension 'l0 and for securing the exposed and adhesive-bearing portion of the former being rectangular, as at I in Figure 4, where the latter, in the illustrative embodiment, is square as at H. The side and end wall portions, above the main 'body portion of the container, thus merge, by appropriate inclinations thereof, from one of these shapes or cross-sections into the other, illustratively, as shown in Figures 3 and 4, along the score lines 55, 8|, 32 and 21.

Thereupon, the composite naps, still projecting downwardly below the plane of the bottom, as shown in Figure 3, are folded inwardly against the under face of the bottom I4 and about respective axes which comprise the now coincidental score lines 18, I2 and 18 on the one hand and 15, I0 and 11 on the other hand.

The folding of these composite flaps may be achieved in any desired or suitable manner but preferably one after the other. For example, composte ap C of Figure 3 andomprising the three flaps 18, 80 and 0I is first folded inwardly and upwardly against the under side of the bottom |4, that portion of the largest flap 10 that is uncovered by the others still bearing adhesive andthat adhesive being preferably suillcient for securing flap C against the underside of the bottom. When `that is completed the bottom view appears as in Figure 5 from which it will be seen that, with flap 19 shaped as above described, it covers a. very substantial area of the bottom I4 and extends with an edge |05 facing toward the still depending composite flap D. The edge I 05 of the large flap 18 is preferably shaped to be symmetrical to the upper cut edge, as viewed in Figure 1, of the flap 80, and in a like manner the edge |06 of the large flap 88 is cut or shaped flap to the upper portion of the flap exten- 76 to be symmetrical to or mate with the lower edge, as viewed in Figure l, of the flap 80. Now when composite ilap D is subsequently folded inwardly and upwardly toward the under side ofthe bottom I4 (Figure 3) or downwardly as viewed in Figure 5, the space left between the edge |05 of ap 18 and the side or score line I2 of the bottom I4, will Ibe symmetrical to and accommodate therein the iiap 00 of composite flap D, so that large flap 89 becomes laid down upon and secured by its adhesive to the exposed face of large flap 19. But the cut edge |08 of the large flap 89,

when the latter'is thus folded down, matches the outline of the upper edge, as viewed in Figure 5, of the intermediate flap 80. As a result, the various naps become interleaved, as is better shown in Figure 6, and the bottom I4 will be seen to be reinforced by two thicknesses of material, namely, in going from left to right of Figure 6, a first section of reenforcement/comprising intermediate flap 80, a portion of iiap 19, then the end portion of flap 19 and the end portion of flap 89, and then the intermediate nap 90 and a portion of ap 89.

Upon the first folding operation oi' the composite flap C, the member employed to fold and/or press it against the bottom Il is preferablyI embossed or engraved to provide areas of progressively differing depths; thus, in Figure 7 the operative face of such a member |01 is shown and it will be seen to have an area E shaped like the iiap 8| which in depth approximates three thicknesses of the stock of which the blank is made, then an aresl F which in depth approximates two thicknesses of the material and is of a shape like that portion of intermediate ap 80 that is not covered by the smallest flap 8|, and an area G of a depth approximating one thickness of the material and an area approximating or equalling that portion of large flap 19 that is left exposed by the flaps Bil-|. Such a member |01 when pressed upwardly against the large composite ilap C as in Figure and with the bottom face of the block |00 (Figure 2) plane, insures the molding, as it were, of successive layers of material or of successively superimposed flaps downwardly against whatever stepped faces may be presented to them and also insures the application of adequate pressure to bring the adhesive-bearing faces dependably into action. The area G (Figure 7) is preferably contoured to approximate the outline of the large flap 19 (Figure 5) and hence its area may vary-with the size 'and shape of the flap 18.

With composite flap C thus folded and pressed into place, and with composite flap D folded into place as already above described, another member or the member that actually effects the folding of ap D is effective to apply suiilcient pressure to press the flap D and its parts downwardly against the supporting faces presented thereto and the face of such member may be stepped or contoured, in -the manner described above in connection with the member |01 of Figure 7, to bring about an individual ironing down of individual portions or sections of the composite flap D itself; this, however, might be dispensed with and a plane faced-member employed or one that has only a recessed area like the area E of Figure 7 but corresponding to the shape and area of flap 93 may suilice because of the interrelationship brought about by the right-hand portion oi' flap 19 (see Figure 6) 'with the ap 90 in virtually filling out the space or under side of the bottom I4 that is uncovered by the flap 90.

Thereby, a strong and dependable and liquidproof bottom structure is achieved; in the preferred form and as appears in Figure 6, the bottom may have three thicknesses of material tightly secured together throughout substantially its entire expanse.

At the corners it will be seen that the stock forms, in the preferred arrangement, a multiple feld devoid of a line of cutting that runs to the corner itself, thus dependably precluding leakage at the corners, while the securing together and also against the bottom of the various iiap portion and the above-described ironing down or stepped pressure effect insure the dependablel closing against leakage of any paths that may exist between layers of the composite flaps or folds.

The block |00 and the thus far completed container are now ready for separation one from the other. For example, the container structure may be held against upward movement by any suitable means and the block |00, which may have any suitable connection as at |08 (Figure 2) with any appropriate means for moving it upwardly, is now started on its movement upwardly. But the lower block portion |0| is of the cross-section indicated at B in Figure 4 whereas the abovedescribed folding operations have given the open end or mouth of the container the rectangular shape A of Figure 4, and it is through this latter opening that the block |00 has to be moved.

First, it will be noted that when the folding operations at the top of the container body are completed to give them the form shown in Figure 4, the score lines 30, 35, 60 and 65 (compare Figure 1 and Figure 4) and which in the blank of Figure 1 are in line with the score lines I5, l1, 20 and i8, respectively, become positioned as shown in Figures 3 and 4; in Figure d it will be seen that score lines 65 and 65 fall virtually in the plane of the end Wall' 22 (defined in part by the fold lines 2d and i8) and score lines 35 and fall substantially in the plane of the end wall 2l (defined, in part by the score lines I1 and i5). but that during the folding operations no bending or folding about the score lines 30, B6 and has thus far taken place.

vAs the block |00 starts its upward movement, the upper portion iii? lbegins to emerge from the mouth of the container (Figure 4) to the longer dimension of which it presents progressively thicker or wider portions as its upward movement proceeds, thus in effect widening up the rectangular opening I of Figure 4 and shortening its length, the bevels |02 aiding inthis action, but by the time the substantially square lower pord@ tion iti of the block iii@ reaches, with its upper- Vit most corners, the lower ends of the score lines 30, 35, 66 and G5, it begins the process of scoring up the upper portion of the container or of conforming it to the cross-section H, whence as it continues its upward movement, the corners of the portion I0! cause the triangular panel-like portions within which the above-mentioned score lines 30, 35, 66 and 65 extend each to become folded about the resptive just-mentioned score lines, thereby avoiding tearing or breaking of this upper portion of the container and temporarily folding it, during the completion of the passage of the lower block portion |0| therethrough, into the cross-section H, illustratively square.

Upon completion of the withdrawal of the member H00, the creasing or folding along these fold lines is largely undone by the inherent tendency of the material or stock to return to unfolded position inasmuch as, it will be noted, the folding about the said fold lines is'unaccompanied by the application of pressure or of an ironing action. accordingly, the upper portion of the container returns generally to the shape and relationship shown in Figures 3 and 4.

The container may now be filled, it being preferable iirst to treat the material with parafn, or the like, whence the upper open end may be :folded into a closure.

This preferably proceeds by b the up per portions, in the illustrative and preferred embodiment (see Figure 4) of double thicknessesl (see the edges 48--12 and 45-68), toward each other, the double thicknesses of the side walls 49-1l and 42-61 bending or curving inwardly toward each other to bring the four edges 12, d8, 45 and 53 together along a straight line, -as ls better shown in Figure 8, to form a straight line apex materially shorter than the width of the side walls themselves, due to the inclinations toward each other oi' the defining edges or fold lines at the upper ends of the side Wall portions, such as the cut edge 69 and the fold line 56 of the side wall portion al, for example (see Figures 1 and 8).

During this operation folding takes place along the score lines 55, 6l, 32 and 3|, as shown in Figure 8, leaving two lateral parts, one comprlsing the panels 58, 50 and 53 and the other comprising the panels 33, 24 and 25, inclined t0- ward each other and respectively about the fold lines I9 and I6 at the upper ends of the end walls 22 and 3l. At this stage the structure appears in plan View as is better shown in Figure 9, from which it will now be clear that triangular panels S and 60 become folded one against the other and likewise panels 53 and 54, panels 28 and 2B, and panels 33 and 34. The resultant double folds or flaps thus formed are then folded inwardly to bring their double edges, such as edges 83 and 54, for example (Figure 10), in alinement with the above-mentioned straight line apex and leaving lateral inwardly inclined faces' that comprise simply the large substantially triangularly shaped panels 24 and 50. There is thus formed a straight line apex preferably and in the illustrative embodiment comprising out edges of the material related together in a plurality of thicknesses, the parts being preferably dimensioned and shaped so that substantially the same number of thicknesses, illustratively eight, of material extend along the apex, the apex, it being noted, being materially shorter in length than the dimension in its own direction of the main body portion of the container.

Upon this comparatively short apex of a plurality of thicknesses of material is now related any suitable means for securing the several thicknesses or the several overlapping end portions t0- "-,gether and illustratively and preferably that comprises a short length of U-shaped sheet metal l l 0, as shown in Figure 11, the two wings or arms Hl and H2 of which are by `any suitable means pressed toward each other to clamp the overlytents, or as may be incurred if the filled container is dropped, are distributed and dissipated throughout the container structure and to the top portion which, by reason of the various folds and its configuration, as better appears in Figures 10 and l2, is mechanically rigid and strong, the securing means, such as the clamping member H2, maintaining the mechanical integrity of this top portion.

Also, it will be noted that I am enabled to eiect material saving because of the small length of the clamping member H2 as compared to'the width of the container itself, and this saving n in sheet metal of the clamping device may be on the order of one-third or one-half.

To gain access to the contents, the securing means is wholly or partially removed and in either case the double triangular aps, such as flaps 26--28 and 33--34, may be unfolded, being easily grasped by the fingers of the hand because they are externally exposed, toform with the triangular panel 2d, which swings outwardly,

a pouring spout, as indicated in the broken lines at J in Figure l0.'

As earlier above noted, pressure is applied to the interfolded composite aps and against the under face of the portion lill of block lud, to press the folded parts into folded position and also to bring about impregnation of the glue or adhesive; in order to diminish the time of application of such pressure and thus to speed up the folding operations, I maycross-rib the mem-v ber through which the external pressure is applied, as indicated at H3 in Figure 14 where the ing upper end portions at the apex tightly together and hold them in sealing position, as shown in Figure 12. But thereby there is brought about a strong anchorage to this top apex of the various components of the composite flaps C and D For example, naps 80 and 8|, themselves sei cured together by adhesive, are ,mechanically connected through the side wall portion 42 to this apex, While the large flap 19 is connected to that apex by the Asider wall portion 61. Side wall portions 42 and 61, however, are secured together by adhesive and the iiaps 80, al and 19 are anchored against the under side of the bottom i4, and thus rthe latter is securely and mechanically tied to this apex. Similar actions and structures mechanically tie the flap D and its components to the same apex. Accordingly, strains to which the bottom may be subjected, as in carrying a load, the liquid or other conpressure-applying member is indicated at Elli operatively relatedto the lower end of the block |00. The ribs H3 thus concentrate the applied pressure, giving the bottom, as seen in Figure 13, an external efl'ect or contour which is the inverse of the face of member l IB. Thus, each rib l i3 creates a depression H5, leaving raised intervening rib-like portions H6. Thereby, also, a quicker ironing out or flattening out of the over-lapped flaps and a quicker setting of the adhesive is achieved and also additional rigidity given the bottom structure, while the ribs il t present edgelike surfaces for contact with the surface ,upon which the container may be rested, thus making for greater cleanliness of appearance.

Or l.' may distribute at suitable points, preferably adjacent each of the four corners, suitable projecting portions l I1, as shown in Figure 15, and these may be formed by giving the member H6 appropriate recesses I i8 shaped, for example, like a segment of a sphere, so that the remaining surface o'i' the member llt, which may be plane or may be cross-ribbed, as above described in connection with Figure 14, is effective to apply the force of compression against the under face of the block lud, thus to permit portions oi the composite bottom structure to enter or flow or be pressed into the recesses H8. If desired, the under face of block l0!) may be provided with substantially mating protrusions H9 (Figure 17) to press the composite bottom structure outwardly and hence into the recesses H8. Ii the large naps 79 and 89 of the composite flaps C and D overlap, as indicated in Figure 15, the resultant and preferably spherical-surfaced protrusions Il l l appear as shown in Figure 15. While if these large ilaps do not overlap, as at 18 and 89B in Figure 16, the bottom structure appears as id, the composite bottom structure appears as shown in Figure 16 with the depressions til?) responding to the ribs H3 with intervening ri l xc parts H6, as described above in connection with Figure i3, but preferably the downward protrusions lll' extend beyond the plane ci the under face of the bottom and thus form four legs to contact with the surface on which the container is handled or rested, thus making for avoidmsce of picking up dirt or of becoming soiled throughout the entire under face of the bottom. The parts of the composite bottom structure that are thus pressed outwardly to form the protrnsions @il also aid in more quickly setting the folded parts against unfolding and in speeding up the corresponding folding and gluing operations. Also, greatertightness against leakage between contacting faces of the aps and the bottom is assured.

it will be seen that there has been provided in this invention a container construction and method of achieving the same in which the various objects hereinabove noted, together with many thoroughly practical advantages, are -successfully achieved.

L@is many possible embodiments may be made of the mechanical features of the above invention and as the art herein described might be varied in various parts, all without departing from the sco e of the invention, it is to be understood 'that all matter hereinabove set forth, or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.

Ii claim:

il. A paper container comprising a four-sided bottom and opposed end walls extended from two opposed sides of the bottom, each end wall having lateral extensions with juxtaposed extensions adhesively overlapped to form opposed side walls, the remaining two sides of said bottom having e tended therefrom and respectively'conoi at least certain of said lateral d respectively overlapping and being to the latter to form at least A, osite dans one at each of said two reof container, the outermost or each composite ap being oi' greater area than an inner ap thereof, said two composite flaps being folded against said bottom with the end portions of said larger flaps overlapping and adhesively secured to each other and to said bottom, said larger flaps having end edges shaped substantially to mate with the contoured edges of the smaller flaps, thereby to maintain substantial uniformity of numbers of plies in the bottom.

2. A paper container comprising a four-sided bottom and opposed end walls extended from two opposed sides of the bottom, each end wall having lateral extensions with juxtaposed extensions adhesively overlapped to form opposed side walls, the remaining two sides of said bottom having flaps extended therefrom and respectively connected at their ends to flaps'extended from said lateral extensions, thereby forming at each of said two remaining sides of the bottom a composite flap made up of three interfolded flaps, certain of the flaps of each composite flap differing in area whereby each composite flap has portions of different plies, said composite flaps being folded against said bottom and overlapping each other throughout respective portions so that at least one area of lesser ply than one composite flap overlaps a substantially corresponding area of lesser ply of the other composite flap.

3. A paper container comprising a four-sided bottom and opposed end walls extended from two opposed sides of the bottom, each end wall having lateral extensions with juxtaposed extensions adhesively overlapped toform opposed side walls, the remaining two sides of said bottom having aps extended therefrom and respectively connected to flaps of at least certain of said lateral extensions Aand respectively overlapping and being adhesively secured to the latter to form at least two composite flaps one at each of said two remaining sides of the container, and said two composite aps being folded against and adhesively secured to said bottom, the outermost flap of each composite ap being of greater area than the inner flap thereof and being of sumcient expanse to cause said two outer fiaps to overlap each other, the overlapped portions of said larger flaps being adhesively secured together.

OSCAR W. WENTZ. 

